<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../../vue 2.6.10.js"></script>
</head>

<body>
    <div id="app">
        <button @click="count++">count+1</button>
        <p>搜索
            <input type="text" v-model="obj.age">
        </p>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    count:2,
                    obj:{
                        name:"zhangsan",
                        age:111
                    }
                }
            },
            watch:{
                count(newval,oldval){
                    console.log("count改变",newval,oldval);
                },
                obj:{
                    immediate:true,
                    deep:true,
                    handler(newval,oldval){
                        console.log("obj发生了变化",newval,oldval);
                    }
                }
            }
        })
</script>
</body>

</html>